Dresden 2011 – scientific programme
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MO: Fachverband Molekülphysik
MO 29: Poster: Electronic Spectroscopy
MO 29.5: Poster
Thursday, March 17, 2011, 16:00–18:00, P1
Fourier-transform spectroscopy on Sr2 — •Alexander Stein, Horst Knöckel, and Eberhard Tiemann — Centre for Quantum Engeneering and Space-Time Research (QUEST) and Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover
There is a high interest in cooling and trapping of cold strontium atoms. Additionally, ultracold Sr2 molecules are proposed to offer good opportunities for new and exciting experiments as the study of the time variation of the electron-proton mass ratio (T. Zelevinsky and S. Kotochigova and J. Ye, Phys. Rev. Lett. 100, 043201 (2008)). Nevertheless, there was no sufficiently precise molecular ground state potential available for the Sr2 molecule allowing the direct calculation of collisional properties like the scattering length, and only few data existed on the excited states.
We now report on new systematic spectroscopic investigations using laser induced fluorescence out of a heat pipe and a Fourier transform spectrometer. Our results on excited states, which were previously experimentally unknown at least from the gas phase, like for the states 11Σu+ and 11Πu, show strong deviations to the available ab initio calculations. Perturbations are observed between the states 11Πu and 2(A)1Σu+, between the state 11Σu+ and the state 13Π0u, and between the state 11Πu and an unknown one. Improved potentials for the excited states 11Σu+ and 2(A)1Σu+ and 11Πu will be presented, together with the new experimental potential for the ground state X1Σg+ for which precise scattering lengths are derived.